dawidwys commented on a change in pull request #17440:
URL: https://github.com/apache/flink/pull/17440#discussion_r732474755



##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/NettyPartitionRequestClient.java
##########
@@ -195,22 +195,26 @@ public void operationComplete(ChannelFuture future) 
throws Exception {
 
     @Override
     public void notifyCreditAvailable(RemoteInputChannel inputChannel) {
-        clientHandler.notifyCreditAvailable(inputChannel);
+        sendToChannel(new AddCreditMessage(inputChannel));
     }
 
     @Override
     public void notifyNewBufferSize(RemoteInputChannel inputChannel, int 
bufferSize) {
-        clientHandler.notifyNewBufferSize(inputChannel, bufferSize);
+        sendToChannel(new NewBufferSizeMessage(inputChannel, bufferSize));
     }
 
     @Override
     public void resumeConsumption(RemoteInputChannel inputChannel) {
-        clientHandler.resumeConsumption(inputChannel);
+        sendToChannel(new ResumeConsumptionMessage(inputChannel));
     }
 
     @Override
     public void acknowledgeAllRecordsProcessed(RemoteInputChannel 
inputChannel) {
-        clientHandler.acknowledgeAllRecordsProcessed(inputChannel);
+        sendToChannel(new AcknowledgeAllRecordsProcessedMessage(inputChannel));
+    }
+
+    private void sendToChannel(ClientOutboundMessage message) {
+        tcpChannel.eventLoop().execute(() -> 
tcpChannel.pipeline().fireUserEventTriggered(message));

Review comment:
       Did you investigate if we need to submit it through the `eventLoop` or 
would it be enough to call 
`tcpChannel.pipeline().fireUserEventTriggered(message)`?




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